134 KJELLMAN, THE ALGJE OF THE AKCTIC SEA. 



Delesseria angustissinia (Tukn.) Griff. 



ill Harv. Pliyc. Brit. t. 83. Fucus alatiis y iiiigustissimus Turn. llist. Fue. 3, p. 60. 

 Descr. Delessuriii aiigustissima J. G. Ag. Spuc. Alg. 2, p. 686. 

 Fig. » » Harv. Phyc. Brit. 1. o. 



S//n. Delesseria alata var. angustissima Kleen, Nordl. Alg. p. 14. 



Remark on the determinatiun of tke species. I have never seen ariy specimeiis of 

 tliis alga from the Polar Sea collected by others, uor have I ever inet with it there 

 iiiyself. It is only on the authority of Kleen that I give it a place iii the present 

 vvork. Kleen's collections contain no specirnens of this species, but in his list of the 

 alga3 of Nordlanden he declares decidedly that D. angustissima Hakv. Phyc. Brit. pl. 

 83 was found there comnion. I have no reason to suppose that Kleen's stateinent 

 should not be founded on accurate comparisons, and the alga growing at Scotland and 

 the Orkney isles, its oecurrenee at Nordlanden is highly probable. 



Habitat. It is litoral, attached to stone.s beneath Fucaceoe. 



Geogr. Distrib. It is known only from the Atlantic region of the Polar Sea, in 

 the Southern part of which region it is commonly spread, according to Kleen. 



Locality: the Norioegian Polar Sea: Nordlanden common and plentiful. 



Delesseria alata (Huds.) Lamour. 

 Ess. p. 124. Fucus alatus Hnos. Pl. Augl. p. 578. 

 Descr. Delesseria alata J. G. Ag. Epicr. p. 483. 

 Fig. » >' Harv. Phyc. Brit. t. 247. 



Eicsicc. » » Aresch. Alg. Scaud. exsicc. N;o 75. 



iSi/ii. Delesseria alata Aresch. Pliyc. Scaiid. p. 292. 

 » a Kleen, Nordl. Alg. p. 14. 



Pucus alatus GuNN. Fl. Norv. 2, p. 91. 

 » » Wg. Pl. Lapp. p. 492. 



Habitat. In the southern part of the Norwegian Polar Sea at Nordlanden this 

 species grows partly in rock-pools between tide-marks, pai-tly within the upper part ot 

 the sublitoral zone, attached to stones or more usually to Laminariacece. Farther north- 

 wards on the coast of Finmarken it always keeps, according to my experience, in the 

 litoral region, forming in exposed localities, together with Ptilota elegans, a dense mat 

 on the steep, flat or somewhat hollow, outsides of stones or rocks covered by masses 

 of Ozothallia and other Fucacew. Here it is dwarfed, seldom, if ever, reaching more 

 than 3 — 5 cm. in height by 1 — 2 mm. in width, while even at Nordlanden it becomes 

 över 8 cm. long and about 4 mm. broad. The specimens from Nordlanden found in 

 Kleen's collections are all sterile, nor does he mention in his treatise on the marine 

 Flora of Nordlanden that he has ever seen any specimen with any kind of propagative 

 organs. Myself found only sterile individuals at Finmarken. On the west coast of 

 Sweden the plant bears tetrasporangia during the winter juonths, December and January, 

 and Areschoug states it to be »mensibus Martii atque Aprilis in mari Bahusiensi fruc- 

 tificans». Accordingly, the plant here develops its organs of propagation in winter and 

 spring. Pi'obably it does so also farther to the north. 



